/* =========================================================
   /estilos/estilo.css — Biblioteca Digital Gratis
   Identidad "archivo institucional": azul marino profundo sobre marfil,
   titulares con serif. Sobria, atemporal. Mobile-first. Sin fuentes web.
   ========================================================= */

/* =============== Tokens ================================= */
:root{
  /* Paleta — institución: marfil + azul marino */
  --c-fondo:#f4f1e9;
  --c-superficie:#fbf9f3;
  --c-superficie-2:#ece6d8;
  --c-borde:#ddd5c4;
  --c-borde-fuerte:#c8bda6;
  --c-texto:#1b2230;
  --c-texto-secundario:#4a5364;
  --c-texto-tenue:#6a7180;
  --c-acento:#16324f;
  --c-acento-claro:#274a6e;
  --c-acento-oscuro:#0f2438;
  --c-acento-wash:rgba(22,50,79,.07);
  --c-acento-wash-2:rgba(22,50,79,.14);
  --c-neutro:#5c4a2f;       /* botón secundario: ocre archivo (no es 2º acento) */
  --c-neutro-claro:#6e5a3b;
  --c-error:#a23226;
  --c-ok:#2e7d52;

  /* Tipografía — serif para titulares (sello editorial) */
  --ff:'Segoe UI',system-ui,-apple-system,'Helvetica Neue',Helvetica,Arial,'Liberation Sans',sans-serif;
  --ff-serif:Georgia,'Iowan Old Style','Palatino Linotype',Palatino,'Times New Roman',serif;
  --fs-h1:clamp(2rem,3.4vw,3rem);
  --fs-h2:clamp(1.5rem,2.4vw,2rem);
  --fs-h3:clamp(1.2rem,1.8vw,1.4rem);
  --fs-lead:clamp(1.05rem,1.3vw,1.18rem);
  --lh-tight:1.18;
  --lh:1.65;

  /* Espacio */
  --gap-xs:.4rem;
  --gap-sm:.75rem;
  --gap:1.25rem;
  --gap-lg:2rem;
  --gap-xl:3rem;

  /* Radios y sombras — esquinas 8px; píldora para chips/nav/búsqueda */
  --rad-sm:6px;
  --rad:8px;
  --rad-lg:14px;
  --rad-pill:999px;
  --sh-sm:0 1px 2px rgba(31,39,51,.05);
  --sh:0 6px 18px rgba(31,39,51,.08);
  --sh-lg:0 14px 34px rgba(31,39,51,.12);

  /* Velocidades */
  --t-fast:.15s ease;
  --t:.22s cubic-bezier(.25,.8,.35,1);
  --t-slow:.45s cubic-bezier(.16,1,.3,1);
}

/* =============== Reset ================================== */
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--ff);
  background:var(--c-fondo);
  color:var(--c-texto);
  line-height:var(--lh);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--c-acento);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--c-acento-claro)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}

/* =============== Accesibilidad ========================== */
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--c-acento);color:#fff;
  padding:.6rem 1rem;font-weight:700;border-radius:0 0 var(--rad) 0;z-index:200;
}
.skip-link:focus{left:0}
a:focus-visible,button:focus-visible,input:focus-visible,
.btn:focus-visible,.menu-toggle:focus-visible{
  outline:2px solid var(--c-acento);outline-offset:3px;border-radius:6px;
}

/* =============== Layout ================================= */
.container{max-width:1240px;margin:0 auto;padding:0 clamp(16px,3vw,28px)}
main{padding:clamp(20px,3vw,40px) 0 clamp(40px,6vw,72px)}
section{margin-block:clamp(28px,5vw,56px)}
section:first-child{margin-top:0}

/* =============== Tipografía ============================= */
h1,h2,h3,h4{font-family:var(--ff-serif);line-height:var(--lh-tight);font-weight:700;letter-spacing:-.006em;color:var(--c-acento-oscuro)}
h1{font-size:var(--fs-h1)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
.lead{font-size:var(--fs-lead);color:var(--c-texto-secundario);max-width:65ch}
.section-title{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-bottom:clamp(18px,2.6vw,28px);gap:1rem;flex-wrap:wrap;
  padding-bottom:.7rem;border-bottom:1px solid var(--c-borde);
}
.section-title h2{margin:0}
.section-title .more{
  color:var(--c-acento);font-size:.95rem;font-weight:600;
}
.section-title .more:hover{color:var(--c-acento-claro)}

/* =============== Header (cabecera clara) ================ */
.main-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(140%) blur(12px);
  -webkit-backdrop-filter:saturate(140%) blur(12px);
  border-top:3px solid var(--c-acento);
  border-bottom:1px solid var(--c-borde);
}
.main-header__inner{
  display:flex;align-items:center;gap:1.25rem;padding:10px 0;
}
.logo{display:inline-flex;align-items:center;gap:.6rem;line-height:0}
.logo img{width:42px;height:42px;transition:transform var(--t)}
.logo:hover img{transform:translateY(-1px)}
.logo__wordmark{
  font-family:var(--ff-serif);line-height:1.04;font-weight:600;
  font-size:1.06rem;color:var(--c-texto);letter-spacing:.005em;
}
.logo__wordmark span{display:block;color:var(--c-acento);font-weight:600}

.main-nav{display:flex;align-items:center;gap:1.25rem;margin-left:auto}
.main-nav ul{list-style:none;display:flex;gap:.3rem}
.main-nav ul a{
  display:inline-block;padding:.5rem .85rem;border-radius:var(--rad-pill);
  font-weight:600;font-size:.95rem;color:var(--c-texto);
  letter-spacing:.005em;transition:background var(--t),color var(--t-fast);
}
.main-nav ul a:hover{background:var(--c-acento-wash);color:var(--c-acento)}

/* Buscador en header */
.header-search{
  position:relative;display:flex;align-items:center;
  background:var(--c-superficie);border:1px solid var(--c-borde-fuerte);
  border-radius:var(--rad-pill);padding:.35rem .9rem .35rem 2.3rem;
  min-width:240px;transition:border-color var(--t-fast),background var(--t-fast),box-shadow var(--t);
}
.header-search:focus-within{
  border-color:var(--c-acento);
  box-shadow:0 0 0 3px var(--c-acento-wash-2);
}
.header-search__icon{
  position:absolute;left:.7rem;top:50%;transform:translateY(-50%);
  width:18px;height:18px;color:var(--c-texto-secundario);stroke:var(--c-texto-secundario);
}
.header-search input{
  background:transparent;border:0;outline:0;color:var(--c-texto);
  width:100%;padding:.35rem 0;font-size:.95rem;
}
.header-search input::placeholder{color:var(--c-texto-tenue)}

/* Menú móvil */
.menu-toggle{display:none;width:34px;height:26px;position:relative;margin-left:auto}
.menu-toggle span{
  position:absolute;left:0;right:0;height:3px;background:var(--c-texto);
  border-radius:3px;transition:transform var(--t),opacity var(--t-fast),top var(--t);
}
.menu-toggle span:nth-child(1){top:0}
.menu-toggle span:nth-child(2){top:50%;transform:translateY(-50%)}
.menu-toggle span:nth-child(3){bottom:0}
.menu-toggle.is-active span:nth-child(1){top:50%;transform:translateY(-50%) rotate(45deg)}
.menu-toggle.is-active span:nth-child(2){opacity:0}
.menu-toggle.is-active span:nth-child(3){bottom:auto;top:50%;transform:translateY(-50%) rotate(-45deg)}

/* =============== Botones ================================ */
.btn{
  --bg:var(--c-acento);
  --fg:#ffffff;
  display:inline-flex;align-items:center;justify-content:center;gap:.6rem;
  padding:.85rem 1.2rem;border-radius:var(--rad);
  background:var(--bg);color:var(--fg);
  font-weight:700;font-size:1rem;letter-spacing:.005em;
  text-align:center;text-decoration:none;
  transition:transform var(--t-fast),box-shadow var(--t),background var(--t-fast);
  position:relative;overflow:hidden;
}
.btn svg{width:1.15em;height:1.15em;flex:none}
.btn small{font-size:.8em;font-weight:600;opacity:.9;margin-left:.25em}
.btn:hover{transform:translateY(-2px);box-shadow:var(--sh)}
.btn:active{transform:translateY(0)}
.btn--amazon{--bg:#f3a52e;--fg:#1f2733}
.btn--amazon:hover{background:#f7b450}
.btn--epub,.btn--pdf,.btn--mobi{background:var(--c-acento);color:#fff}
.btn--epub:hover,.btn--pdf:hover,.btn--mobi:hover{background:var(--c-acento-claro)}
.btn--secundario{--bg:var(--c-neutro);--fg:#fff}
.btn--secundario:hover{background:var(--c-neutro-claro)}
.btn--ghost{--bg:transparent;--fg:var(--c-acento);border:1px solid var(--c-borde-fuerte)}
.btn--ghost:hover{background:var(--c-acento-wash);color:var(--c-acento);border-color:var(--c-acento)}
.btn--disabled{
  background:var(--c-superficie-2);color:var(--c-texto-secundario);
  cursor:not-allowed;pointer-events:none;border:1px solid var(--c-borde);
}
.botones-descarga{display:grid;gap:.7rem}

/* CTA inline (píldora con flecha) */
.cta-inline{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.5rem .9rem;border-radius:var(--rad-pill);
  background:var(--c-superficie);border:1px solid var(--c-borde-fuerte);
  color:var(--c-texto);font-weight:600;font-size:.92rem;
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast);
}
.cta-inline::after{content:"\203A";transition:transform var(--t-fast)}
.cta-inline:hover{background:var(--c-acento);color:#fff;border-color:var(--c-acento)}
.cta-inline:hover::after{transform:translateX(3px)}

/* =============== Hero (home) ============================ */
.hero{
  position:relative;padding:clamp(32px,6vw,64px) 0 clamp(28px,5vw,52px);
  overflow:hidden;border-bottom:1px solid var(--c-borde);
  background:linear-gradient(180deg,#fff,var(--c-fondo));
}
.hero__inner{position:relative;z-index:1;display:grid;gap:clamp(18px,2.6vw,28px);max-width:880px}
.hero h1{font-size:clamp(2.1rem,4.2vw,3.4rem);letter-spacing:-.022em}
.hero h1 .accent{color:var(--c-acento)}
.hero .lead{font-size:clamp(1.05rem,1.4vw,1.22rem);max-width:60ch}
.hero__stats{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:.6rem;max-width:520px;margin-top:.4rem;
}
.hero__stat{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);padding:.85rem 1rem;text-align:center;
}
.hero__stat strong{display:block;font-size:1.6rem;color:var(--c-acento);line-height:1.1;letter-spacing:-.01em}
.hero__stat span{font-size:.82rem;color:var(--c-texto-secundario);text-transform:uppercase;letter-spacing:.05em}
.hero__cta{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.3rem}

/* =============== Book cards (grid de libros) ============ */
.cluster-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
  gap:clamp(16px,2vw,28px);
}
@media (min-width:760px){
  .cluster-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
}
.book-card{position:relative}
.book-card a{
  display:block;color:var(--c-texto);text-decoration:none;
  border-radius:var(--rad);transition:transform var(--t);
}
.book-card img{
  border-radius:var(--rad-sm);box-shadow:var(--sh);
  margin-bottom:.7rem;aspect-ratio:160/242;object-fit:cover;
  background:var(--c-superficie-2);
  border:1px solid var(--c-borde);
  transition:transform var(--t),box-shadow var(--t);
}
.book-card:hover img{
  transform:translateY(-6px);
  box-shadow:var(--sh-lg);
  border-color:var(--c-borde-fuerte);
}
.book-card-title{
  font-size:.95rem;font-weight:600;line-height:1.3;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;text-overflow:ellipsis;
}
.book-card:hover .book-card-title{color:var(--c-acento)}

/* =============== Página de libro ======================== */
.book-page-main{padding-block:clamp(20px,3vw,48px)}
.book-details-grid{
  display:grid;grid-template-columns:320px 1fr;gap:clamp(24px,4vw,56px);align-items:flex-start;
}
.book-cover-actions{position:sticky;top:96px}
.book-cover img{
  border-radius:var(--rad);box-shadow:var(--sh-lg);
  margin-bottom:1.25rem;aspect-ratio:300/453;object-fit:cover;
  background:var(--c-superficie-2);border:1px solid var(--c-borde);
  transition:transform var(--t);
}
.book-cover img:hover{transform:translateY(-3px)}
.book-info h1{font-size:clamp(1.8rem,3vw,2.4rem);margin-bottom:.3rem}
.book-author{font-size:1.1rem;color:var(--c-texto-secundario);margin-bottom:1rem}
.book-author a{color:var(--c-acento);border-bottom:1px solid transparent}
.book-author a:hover{color:var(--c-acento-claro);border-bottom-color:currentColor}
.star-rating{
  display:inline-flex;align-items:center;gap:.4rem;
  font-size:1.1rem;color:#d98a1f;margin-bottom:1.2rem;
}
.star-rating .rating-value{color:var(--c-texto-secundario);font-weight:600;font-size:.95rem}
.book-meta-data{margin-bottom:1.5rem}
.book-meta-data ul{
  list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:.85rem 1.5rem;
  background:var(--c-superficie);padding:1.1rem 1.25rem;border-radius:var(--rad);border:1px solid var(--c-borde);
}
.book-meta-data li{font-size:.95rem}
.book-meta-data strong{
  display:block;color:var(--c-texto-secundario);font-weight:600;
  font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;margin-bottom:.1rem;
}
.book-categories{grid-column:1 / -1}
.book-categories a{
  display:inline-flex;align-items:center;background:var(--c-superficie-2);
  padding:.3rem .8rem;border-radius:var(--rad-pill);font-size:.85rem;
  margin:.25rem .35rem .25rem 0;border:1px solid var(--c-borde);color:var(--c-texto);
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast);
}
.book-categories a:hover{background:var(--c-acento);color:#fff;border-color:var(--c-acento)}
.book-description{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  padding:clamp(20px,2.5vw,32px);border-radius:var(--rad);
}
.book-description__h{
  font-size:var(--fs-h3);margin-bottom:.85rem;
  color:var(--c-texto);font-weight:700;
}
.book-description p{margin-bottom:1em}
.book-description p:last-child{margin-bottom:0}
.book-howto{
  margin-top:clamp(20px,3vw,32px);padding:clamp(16px,2vw,24px);
  background:var(--c-acento-wash);border:1px solid var(--c-acento-wash-2);border-radius:var(--rad);
}
.book-howto h2{font-size:var(--fs-h3);margin-bottom:.6rem;color:var(--c-acento-oscuro)}
.book-howto ol{margin:.4rem 0 .9rem 1.2rem}
.book-howto li{margin:.3rem 0}
.book-howto p{margin:0;color:var(--c-texto-secundario)}
.book-howto a{font-weight:600}
.book-cluster{margin-top:clamp(32px,5vw,56px);padding-top:clamp(28px,4vw,48px);border-top:1px solid var(--c-borde)}
.book-cluster h2{margin-bottom:clamp(16px,2vw,24px)}

/* =============== Breadcrumbs ============================ */
.breadcrumbs{margin:0 0 1.25rem}
.breadcrumbs ol{
  list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;
  color:var(--c-texto-secundario);font-size:.9rem;
}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li+li::before{content:"\203A";margin:0 .35rem;color:var(--c-texto-tenue)}
.breadcrumbs a{color:var(--c-texto-secundario)}
.breadcrumbs a:hover{color:var(--c-acento)}
.breadcrumbs [aria-current="page"]{color:var(--c-texto)}

/* =============== Autores (listado) ====================== */
.author-tools{margin:1rem 0 1.25rem}
.author-search{
  width:100%;max-width:520px;padding:.85rem 1rem;
  border-radius:var(--rad);border:1px solid var(--c-borde-fuerte);
  background:var(--c-superficie);color:var(--c-texto);
  transition:border-color var(--t-fast),box-shadow var(--t);
}
.author-search:focus{outline:0;border-color:var(--c-acento);box-shadow:0 0 0 3px var(--c-acento-wash-2)}
.alpha-nav{display:flex;flex-wrap:wrap;gap:.4rem;margin:1rem 0 1.5rem}
.alpha-nav .alpha-chip{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:2.3rem;height:2.3rem;padding:0 .7rem;
  border-radius:var(--rad-pill);border:1px solid var(--c-borde-fuerte);
  background:var(--c-superficie);color:var(--c-texto);font-weight:700;
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast);
}
.alpha-nav .alpha-chip:hover{background:var(--c-acento);color:#fff;border-color:var(--c-acento);transform:translateY(-2px)}
.author-letter{font-size:1.6rem;margin:1.5rem 0 .75rem;padding-bottom:.4rem;border-bottom:1px solid var(--c-borde)}
.author-list{
  columns:4 220px;column-gap:1.5rem;
  list-style:none;margin:0 0 1.5rem;padding:0;
}
.author-item{break-inside:avoid;margin-bottom:.25rem}
.author-item a{
  display:inline-block;padding:.25rem .55rem;border-radius:var(--rad-sm);
  color:var(--c-texto);border:1px solid transparent;
  transition:background var(--t-fast),border-color var(--t-fast),color var(--t-fast);
}
.author-item a:hover{background:var(--c-acento-wash);border-color:var(--c-borde-fuerte);color:var(--c-acento)}

/* =============== Categorías ============================= */
.cat-grid{display:grid;gap:1rem;grid-template-columns:repeat(2,minmax(0,1fr))}
@media (min-width:760px){.cat-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (min-width:1000px){.cat-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
.cat-card{display:block;text-decoration:none;color:var(--c-texto)}
.cat-card-figure{
  position:relative;aspect-ratio:5/4;border-radius:var(--rad);
  overflow:hidden;background:var(--c-superficie-2);
  border:1px solid var(--c-borde);
  transition:transform var(--t),box-shadow var(--t),border-color var(--t-fast);
  display:flex;align-items:flex-end;padding:1rem;
}
.cat-card-figure img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:.9;transition:opacity var(--t-fast),transform var(--t-slow);
}
.cat-card-figure::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(31,39,51,.05) 0%,rgba(31,39,51,.72) 100%);
}
.cat-card-figure figcaption{
  position:relative;z-index:1;font-weight:700;font-size:1.1rem;
  color:#fff;text-shadow:0 1px 4px rgba(0,0,0,.5);
}
.cat-card:hover .cat-card-figure{transform:translateY(-3px);border-color:var(--c-acento);box-shadow:var(--sh)}
.cat-card:hover .cat-card-figure img{transform:scale(1.05)}

.subcat-block{margin:1rem 0 2rem}
.subcat-block h2{font-size:1rem;color:var(--c-texto-secundario);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.7rem}
.subcat-list{display:flex;flex-wrap:wrap;gap:.5rem}
.subcat-list a{
  display:inline-block;background:var(--c-superficie);border:1px solid var(--c-borde-fuerte);
  color:var(--c-texto);padding:.4rem .85rem;border-radius:var(--rad-pill);font-size:.92rem;
  transition:background var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast);
}
.subcat-list a:hover{background:var(--c-acento);color:#fff;border-color:var(--c-acento);transform:translateY(-2px)}

/* =============== Texto enriquecido ====================== */
.rt p{margin:.2rem 0 1.05rem;line-height:1.75}
.rt h2{font-size:clamp(1.5rem,2.4vw,1.9rem);margin:1.6rem 0 .65rem;line-height:1.25}
.rt h3{font-size:clamp(1.15rem,1.8vw,1.3rem);margin:1.2rem 0 .45rem;line-height:1.35}
.rt ul,.rt ol{margin:.4rem 0 1.05rem 1.4rem}
.rt li{margin:.25rem 0}
.rt strong{color:var(--c-texto)}
.rt a{font-weight:600;border-bottom:1px solid var(--c-acento-wash-2)}
.rt a:hover{border-bottom-color:var(--c-acento)}

/* Figuras en contenido rico */
.rt figure{margin:1.2rem 0 1.5rem}
.rt figure img{border-radius:var(--rad);border:1px solid var(--c-borde);box-shadow:var(--sh-sm)}
.rt figcaption{margin-top:.5rem;font-size:.88rem;color:var(--c-texto-secundario);text-align:center}

/* Tablas en contenido rico */
.rt table{
  width:100%;border-collapse:collapse;margin:1rem 0 1.5rem;
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);overflow:hidden;
}
.rt th,.rt td{
  text-align:left;padding:.7rem .9rem;
  border-bottom:1px solid var(--c-borde);vertical-align:top;
}
.rt thead th{
  background:var(--c-superficie-2);color:var(--c-texto);
  font-weight:700;font-size:.88rem;text-transform:uppercase;letter-spacing:.04em;
  border-bottom:1px solid var(--c-borde-fuerte);
}
.rt tr:last-child td{border-bottom:0}
.table-compare .row-featured{
  background:linear-gradient(90deg,var(--c-acento-wash),rgba(47,93,138,0));
  border-left:3px solid var(--c-acento);
}
.table-compare .row-featured .star{color:var(--c-acento);margin-left:.25rem}

/* FAQ */
.faq-block details{
  border:1px solid var(--c-borde);background:var(--c-superficie);
  border-radius:var(--rad);padding:1rem 1.15rem;margin:.65rem 0;
  transition:border-color var(--t-fast),box-shadow var(--t-fast);
}
.faq-block details[open]{border-color:var(--c-acento);box-shadow:var(--sh-sm)}
.faq-block summary{
  cursor:pointer;list-style:none;font-weight:700;font-size:1.02rem;
  display:flex;align-items:center;gap:.6rem;
}
.faq-block summary::-webkit-details-marker{display:none}
.faq-block summary::after{
  content:"+";margin-left:auto;color:var(--c-acento);font-size:1.4rem;
  transition:transform var(--t),color var(--t-fast);font-weight:400;line-height:1;
}
.faq-block details[open] summary::after{transform:rotate(45deg)}
.faq-block p{margin-top:.6rem;color:var(--c-texto-secundario)}
.faq-grid{display:grid;grid-template-columns:1fr;gap:.75rem}
@media (min-width:900px){.faq-grid{grid-template-columns:1fr 1fr}}

/* Tarjeta de guía (hub de recursos) */
.guia-card{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);padding:1.1rem 1.25rem;
  transition:border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.guia-card:hover{border-color:var(--c-acento);transform:translateY(-2px);box-shadow:var(--sh)}
.guia-card h3{font-size:1.1rem;margin-bottom:.4rem}
.guia-card p{color:var(--c-texto-secundario);font-size:.95rem}

/* Listas SEO */
.seo-list{margin:.5rem 0 1rem 1.3rem}
.seo-list li{margin:.3rem 0}

/* =============== Paginación ============================= */
.pagination{
  display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;justify-content:center;
  margin:2rem 0 2.5rem;
}
.pagination a,.pagination .page-ellipsis,.pagination .current{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:2.5rem;height:2.5rem;padding:0 .85rem;
  border-radius:var(--rad-pill);border:1px solid var(--c-borde-fuerte);
  background:var(--c-superficie);color:var(--c-texto);
  font-weight:600;font-size:.95rem;line-height:1;text-decoration:none;
  transition:background var(--t-fast),border-color var(--t-fast),color var(--t-fast),transform var(--t-fast);
}
.pagination a:hover{background:var(--c-acento);border-color:var(--c-acento);color:#fff;transform:translateY(-2px)}
.pagination .current{background:var(--c-acento);border-color:var(--c-acento);color:#fff;pointer-events:none}
.pagination .page-ellipsis{border:0;background:transparent;color:var(--c-texto-secundario);min-width:auto;padding:0 .25rem}
.pagination .page-prev::before{content:"\2039";margin-right:.4rem}
.pagination .page-next::after{content:"\203A";margin-left:.4rem}

/* =============== Footer (colofón claro) ================= */
.main-footer{
  background:var(--c-superficie);border-top:1px solid var(--c-borde);
  padding:clamp(32px,5vw,56px) 0 clamp(20px,3vw,28px);margin-top:clamp(40px,6vw,80px);
}
.main-footer__inner{display:grid;gap:clamp(24px,4vw,40px);grid-template-columns:1fr}
@media (min-width:600px) and (max-width:819px){.main-footer__inner{grid-template-columns:1fr 1fr}}
@media (min-width:820px){.main-footer__inner{grid-template-columns:1.6fr 1fr 1fr 1fr;align-items:start}}
.main-footer__brand{max-width:380px}
.main-footer__logo{display:inline-flex;align-items:center;gap:.55rem;margin-bottom:1rem;line-height:0}
.main-footer__logo img{width:40px;height:40px}
.main-footer__logo .logo__wordmark{font-size:1rem}
.main-footer__claim{color:var(--c-texto-secundario);font-size:.95rem}
.main-footer__claim strong{color:var(--c-texto)}
.main-footer__cols{display:contents}
.main-footer__cols h2{
  font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;
  color:var(--c-texto-secundario);font-weight:700;margin-bottom:.85rem;
}
.main-footer__cols ul{list-style:none;display:grid;gap:.4rem}
.main-footer__cols a{color:var(--c-texto)}
.main-footer__cols a:hover{color:var(--c-acento)}
.main-footer__legal{
  grid-column:1 / -1;padding-top:clamp(20px,3vw,28px);margin-top:.5rem;
  border-top:1px solid var(--c-borde);
  color:var(--c-texto-tenue);font-size:.85rem;display:grid;gap:.4rem;
}
.main-footer__disclaimer{max-width:65ch}

/* =============== Buscador (resultados) ================== */
.search-page{padding:clamp(24px,4vw,48px) 0}
.search-results{display:grid;gap:.75rem;margin-top:1.5rem}
.search-result{
  display:flex;gap:.85rem;align-items:center;padding:.8rem 1rem;
  background:var(--c-superficie);border:1px solid var(--c-borde);border-radius:var(--rad);
  transition:border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.search-result:hover{border-color:var(--c-acento);transform:translateY(-1px);box-shadow:var(--sh-sm)}
.search-result__cover{width:48px;height:72px;flex:none;border-radius:4px;object-fit:cover;background:var(--c-superficie-2);border:1px solid var(--c-borde)}
.search-result__title{font-weight:600;color:var(--c-texto);line-height:1.3}
.search-result__author{font-size:.85rem;color:var(--c-texto-secundario)}
.search-empty{color:var(--c-texto-secundario);padding:2rem 0}

/* =============== Autor premium ========================== */
.autor-datos{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);padding:clamp(16px,2vw,24px);
  margin:1rem 0 1.5rem;
}
.autor-datos__grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:1rem 1.5rem;margin:0;
}
.autor-datos__grid > div{display:flex;flex-direction:column}
.autor-datos dt{
  font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--c-texto-secundario);font-weight:600;margin-bottom:.15rem;
}
.autor-datos dd{margin:0;color:var(--c-texto);font-weight:500}

.autor-sagas{display:grid;gap:1rem}
@media (min-width:760px){.autor-sagas{grid-template-columns:repeat(2,minmax(0,1fr))}}
.autor-saga{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);padding:clamp(16px,2vw,22px);
  transition:border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.autor-saga:hover{border-color:var(--c-acento);transform:translateY(-2px);box-shadow:var(--sh)}
.autor-saga h3{
  font-size:1.15rem;margin-bottom:.5rem;color:var(--c-acento-oscuro);
}
.autor-saga__desc{color:var(--c-texto-secundario);font-size:.95rem;margin-bottom:.65rem}
.autor-saga__libros{
  list-style:decimal;padding-left:1.2rem;color:var(--c-texto);font-size:.95rem;
}
.autor-saga__libros li{margin:.25rem 0}
.autor-saga__libros a{font-weight:500}

/* =============== Enlaces oficiales (hubs) =============== */
.enlaces-oficiales{margin:1rem 0 2rem}
.enlaces-oficiales h2{margin-bottom:.85rem}
.enlaces-oficiales__list{
  list-style:none;display:grid;gap:.65rem;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin:0;
}
.enlaces-oficiales__list li{
  background:var(--c-superficie);border:1px solid var(--c-borde);
  border-radius:var(--rad);padding:.9rem 1rem;
  transition:border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.enlaces-oficiales__list li:hover{border-color:var(--c-acento);transform:translateY(-2px);box-shadow:var(--sh)}
.enlaces-oficiales__list a{display:inline-block;color:var(--c-texto)}
.enlaces-oficiales__list a:hover{color:var(--c-acento)}
.enlaces-oficiales__desc{color:var(--c-texto-secundario);font-size:.9rem;display:block;margin-top:.2rem}

/* =============== Microinteracciones (reveal) ============ */
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1)}
html.js .reveal.is-visible{opacity:1;transform:translateY(0)}
html.js .reveal-stagger > *{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s cubic-bezier(.2,.7,.2,1)}
html.js .reveal-stagger.is-visible > *{opacity:1;transform:translateY(0)}
.reveal-stagger.is-visible > *:nth-child(1){transition-delay:.02s}
.reveal-stagger.is-visible > *:nth-child(2){transition-delay:.06s}
.reveal-stagger.is-visible > *:nth-child(3){transition-delay:.1s}
.reveal-stagger.is-visible > *:nth-child(4){transition-delay:.14s}
.reveal-stagger.is-visible > *:nth-child(5){transition-delay:.18s}
.reveal-stagger.is-visible > *:nth-child(6){transition-delay:.22s}
.reveal-stagger.is-visible > *:nth-child(n+7){transition-delay:.26s}

/* =============== Responsive ============================= */
@media (max-width:960px){
  .book-details-grid{grid-template-columns:1fr;gap:2rem}
  .book-cover-actions{
    position:static;display:grid;grid-template-columns:240px 1fr;gap:1.5rem;align-items:flex-start;
  }
  .book-cover img{margin-bottom:0}
}
@media (max-width:820px){
  .main-header__inner{flex-wrap:wrap}
  .menu-toggle{display:block;order:3}
  .main-nav{
    order:4;flex-basis:100%;flex-direction:column;align-items:stretch;gap:1rem;
    max-height:0;overflow:hidden;transition:max-height var(--t-slow),padding var(--t);
    padding-top:0;
  }
  .main-nav.is-open{max-height:600px;padding-top:1rem;padding-bottom:.5rem}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:.25rem}
  .main-nav ul a{padding:.7rem 1rem;border-radius:var(--rad)}
  .header-search{min-width:0;width:100%}
  .author-list{columns:2 180px}
}
@media (max-width:520px){
  .logo__wordmark{display:none}
}
@media (max-width:600px){
  .hero__stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:.35rem}
  .hero__stat{padding:.65rem .35rem}
  .hero__stat strong{font-size:1.3rem}
  .hero__stat span{font-size:.7rem}
  .book-cover-actions{grid-template-columns:1fr}
  .book-cover{max-width:240px;margin:0 auto}
  .book-meta-data ul{grid-template-columns:1fr}
  .cluster-grid{grid-template-columns:repeat(auto-fill,minmax(125px,1fr));gap:1rem}
  .author-list{columns:1}
}

/* =============== Reduce motion ========================== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;scroll-behavior:auto !important;
  }
  .reveal,.reveal-stagger > *{opacity:1 !important;transform:none !important}
}

/* =============== Print ================================== */
@media print{
  .main-header,.main-footer,.botones-descarga,.book-cluster,.breadcrumbs{display:none !important}
  body{background:#fff;color:#000}
  .book-description{border:1px solid #ccc;background:#fff}
}

/* =============== Rendimiento (content-visibility) ======= */
/* Evita renderizar secciones siempre bajo el pliegue hasta que se acercan
   al viewport. Gran ahorro en páginas largas (índice A-Z de autores,
   FAQs, cluster de libros relacionados). No afecta al LCP. */
.author-group{content-visibility:auto;contain-intrinsic-size:auto 1200px}
.book-cluster{content-visibility:auto;contain-intrinsic-size:auto 520px}
.faq-block{content-visibility:auto;contain-intrinsic-size:auto 480px}